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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8883c889d1e7f64309bc17a206729d5b228b8748e4f41cadafe90dc55bb596fd' 
  AND token = 'ZS+la754Mb3lt3844sXXN42W06ejDW615XNd9dQDoms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}